Cisco 2940 User Manual download pdf (Page 50)

3-2

Catalyst 2940 Switch Hardware Installation Guide

OL-6157-01

Chapter 3 Troubleshooting

Diagnosing Common Problems

Table 3-1 Common Connectivity Problems and Their Solutions

Symptom Possible Cause Resolution

No connectivity to 10/100 ports

or 10/100/1000 port.

Incorrect or bad cable.

• Remove and reconnect cable

to switch and PC. Wait 30

seconds for port status LED

on switch to turn green.

These are the results of no link at

both ends:

• Cable not properly installed

between switch and PC.

• A crossover cable was used

when a straight-through was

required, or vice-versa.

• To identify a crossover

cable, see Figure B-12 on

page B-9.

• The cable is wired

incorrectly.

• Verify that the cable is wired

correctly. See Figure B-6 on

page B-5 through

Figure B-9 on page B-6 for

the correct pinouts of 10/100

cables. For the proper

application of crossover and

straight-through cables, see

the “Cable and Adapter

Specifications” section on

page B-5.

• Replace it with a tested good

cable.

• STP is checking for possible

network loops.

• Wait 30 seconds for port

status LED to turn green.

No connectivity to

100BASE-FX port.

An SFP module was installed in

the switch at power on.

Note The SFP module slots

and the 100BASE-FX

port cannot both be used

at the same time. If an

SFP module is installed

when the switch is

powered on, the

100BASE-FX port is

disabled.

Remove the SFP module, and

reboot the switch.

Note See the “Connecting to

an SFP Module” section

on page 2-12 and the

Cisco Small

Form-Factor Pluggable

Modules Installation

Notes (order number

DOC-7815160=) for

procedures on removing

an SFP module.

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